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Question

The reaction, 2A+B Products, follows the mechanism:


2AA2 (at equilibrium)
A2+B Products (slow)

The order of the reaction is:

A
2
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B
1
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C
3
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D
112
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Solution

The correct option is C 3
From the slow step, rate=k[A2][B] ...... (1)
From the equilibrium reaction, equilibrium constant K=[A2][A]2
[A2]=K[A]2......(2)

Substitute equation (2) in equation (1).
rate=kK[A]2[B]

Thus the overall order of the reaction is 2+1=3.

Hence, option C is correct.

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